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The antennas contained in mobile phones, including smartphones, emit radiofrequency (RF) radiation (non-ionizing "radio waves" such as microwaves); the parts of the head or body nearest to the antenna can absorb this energy and convert it to heat or to synchronised molecular vibrations (the term 'heat', properly applies only to disordered molecular motion).
The experience of eye strain when reading in dim light has given rise to the common misconception that such an activity causes permanent eye damage. [3] When concentrating on a visually intense task, such as continuously focusing on a book or computer monitor, the ciliary muscles and the extraocular muscles are strained. This causes discomfort ...
The bright light overwhelms the retinas of the eyes and generally gradually fades, lasting anywhere from a few seconds to a few minutes. However, if the eyes are exposed to a high enough level of light, such as a nuclear explosion, the blindness can become permanent. Flash blindness may also occur in everyday life.
Handwritten vandalism found in a library book's index. Library-book or -materials vandalism, sometimes termed intentional destruction of books or materials [citation needed] or book or material mutilation [1] is the act of damaging or defacing library books or other library holdings. It is a considerable loss of resources for libraries with ...
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People who sit at a desk all day face a greater risk for heart disease, according to a new study published in the Journal of the American College of Cardiology.. Even if those desk dwellers do ...
Obesity is a common result of spending great amounts of time on screens like a television, video games, a smartphone, or a computer screen. [28] Studies have shown that if the amount of screen time adolescents spend was limited, the likelihood of obesity can be reduced. [ 29 ]
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